DDos and hardware to work well with Litespeed

Maybe i am under a ddos attack i am not sure and i want to ask if my hardware is ok to add litespeed and if i apy for installation does the stuff help me with this attack to do the correct settings for me?

I own a dedicated Xeon dual core with 4gb ram and 100mbit unshare speed.

I am planning to move to quad core xeon 8gb ram and 1.000mbit as is getting very annoying this high server load.

Is it possible from a stuff to check it first before i buy the new server if i realy need it?

I own a forum with about 75 users per 15 minutes and a shoutbox with ajax refresh rate 7 seconds and top 10 statistics every 30 seconds refreshing.

I need 15 maybe more seconds to aload any page in my forum and from cpanel i can see server load with red mark.

Now i restart the server and is working fast for many minutes and then the same problem..

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Shoutbox I think is what George meant. They are really bad and really increase load and traffic. A forum with 30 users online might fit on shared hosting account becomes stressing for a dedicated server. The reason is those shoutboxes are generating page views while the user is not actually doing anything.

So lets take your example. 75 users online at 7 second refresh. That will do ~642 page views a minute or about 11 requests/sec. Not a lot really but thats with just 75 users online. That also does not count any of the real traffic of the site. You want to improve loads I guarantee disabling that will make a huge difference on the database and php portion.